Add bot config for ClangToTiOS

ios/build/bots/chromium.fyi/ClangToTiOS.json

Index: ios/build/bots/chromium.fyi/ClangToTiOS.json
diff --git a/ios/build/bots/chromium.mac/iOS_Device_(ninja).json b/ios/build/bots/chromium.fyi/ClangToTiOS.json
similarity index 53%
copy from ios/build/bots/chromium.mac/iOS_Device_(ninja).json
copy to ios/build/bots/chromium.fyi/ClangToTiOS.json
index e682051748220a3cb91cf553f9bc4ae6c6179e4b..26663dfc0db72752f759802006c0d4dcd4f8344b 100644
--- a/ios/build/bots/chromium.mac/iOS_Device_(ninja).json
+++ b/ios/build/bots/chromium.fyi/ClangToTiOS.json
@@ -1,14 +1,19 @@
 {
   "owners": [
-    "smut"
+    "hans"
   ],
   "comments": [
-    "Builder for fat binaries using ninja."
+    "Clang tip-of-tree builder for iOS"
   ],
   "xcode version": "6.2",
   "GYP_DEFINES": {
     "chromium_ios_signing": "0",
-    "target_subarch": "both"
+    "clang_use_chrome_plugins": "0",
+    "target_subarch": "arm32",
+    "werror": ""
+  },
+  "env": {
+    "LLVM_FORCE_HEAD_REVISION": "YES"

[smut, 2015/05/19 00:29:23]

This won't work unless you make it work. See
https://chromium.googlesource.com/chromium/tools/build/+/master/scripts/slave....

[hans, 2015/05/19 16:09:35]

Trying this in https://codereview.chromium.org/1145733003

   },
   "compiler": "ninja",
   "configuration": "Release",